Atacicept is a recombinant fusion protein that binds and neutralizes two molecules important for the maturation, proliferation, and survival of B cells: BLyS and APRIL. While B-cell depleting therapies have demonstrated efficacy in RA, atacicept differs from the anti-CD20 targeted monoclonal antibodies, such as rituximab, as its effects extend over the entire lineage of B lymphocytes, including plasma cells.
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